Window Tint .. it's good for you and it's good for the Earth.
Energy Efficient Window Film
Most modern window films reflect significant solar energy, while absorbing another portion of the energy. The result is that the amount of solar radiation transmitted inside the room is considerably less. Specs will vary depending on the window film selected.
The movement or transfer of heat from a region of higher temperature to one of cooler temperature is called heat transfer. The transfer of heat always flows from hot to cold. No heat will transfer if there is no difference in temperature.
There are three types of heat transfer: radiation, conduction, and convection. For window film, radiation is the most important method of heat transfer because it moves infrared waves. This is why we refer to solar energy as solar radiation.
Energy Saving Window Tint
Solar energy through a window is transferred or transmitted by infrared waves. Radiant energy is converted to heat when it strikes people or objects. If you block the transfer of this energy you keep it from turning into heat because it never strikes an object. Window film interrupts the transfer of this energy by reflecting the energy back.
Transmission is basically the percentage of Solar energy (UV + Visible Light + Near Infrared) that can passes through a window. Reflection is the ratio of solar energy reflected back to the source, expressed as a percentage. Absorption is the percentage of solar energy absorbed to that of the total solar energy.
With solar window film installed on the inside of a window, the proportions are changed dramatically, with reflected energy and absorption increasing. This corresponds to a reduction in solar heat transmitted inside the room or the automobile. The properties of the window film dramatically influence how and in what way transmission, reflection and absorption change.
How Lowering the Temperature Saves Energy
Only a few degrees in temperature reduction can have up to a 25% reduction in cooling costs, due to the laws of thermodynamics. It requires considerable amounts of energy to remove heat from a room through air conditioning. During peak summer times in the middle of the day, loads on air conditioning systems can be reduced enough to turn off entire units or to install a less costly system.
In addition to the energy saving benefits, solar window film can increase thermal comfort, reduce glare, while at the same time rejecting 99% of the UV radiation reducing fading and the risk of skin cancer.